Combination oil and gas burner



Patented Aug. 8, `1,950

- Y 2,518,025 A I... y@('iciiviiall'ililji;'io'N OIL AND GAS BURNER 'fi -Piiilio Ki'ght, Toledo, ohio, ssignor to surff vface-Combustion Corporation, Toledo, Ohio, a

corporation of Ohio 4"Application Maron 17, iaisfseriai No. 15,326 o el'hisinvention. relates ttol oilK and] ygas s burners for industrial use and more particularlytov means for converting an' alreadyLinstalled gas lburner of well known type to an oill burner so that oil instead-of gas may be burned when gas is not available. One of the problemsinvolved inconvertng'an already installed gas burner to an oil burner is how to make thechange with minimum trouble and expense' and with minimuml change injthe parts' of the gas'burner assembly. The present invention solves these 'and other Aproblems in avrelatively simple and practical way as will hereinafter morefully appear.

vFor a consideration of what, Inconsidertobe novel and my inventionv attentionjis directed to' the following specification'a'nd the claim appended thereto.

In the accompanying-"drawings forming part of this specification- I. .Y y

Fig. 1 is alongitudinal sectional view of a gas burner with the oil conversion means of the'present invention applied thereto.

Fig. `2 is a transverse section on line 2--2 of Fig. 1.

Fig. 3 is an enlarged sectional view ofthe oil burner element embodied in Fig. 1.

Fig. 4 shows another way of applying the oil conversion means to the gas burner assembly disclosed in Fig. 1.

Olne well known type of industrial gas burner with which the present invention is concerned comprises a cylindrical combustion tunnel I l 1 claim. (01.158711) which is ordinarily formed in a ceramic block I2 adapted to form part of a furnace wall I0, the iblock extending from a metal holder I3 adapted to be secured to the outer steel casing I4 of said furnace wall. The tunnel is so proportioned as to permit a combustible mixture of air and fuel gas entering through port or passage I5 to be burned to substantial completion within the tunnel so that only highly heated products of combustion enter the furnace chamber proper. The passage I5 is conveniently formed in a metal body I6 having a radial flange I1 for securing it to the outer face of the block holder I3. I-Ieat dissipatlng fins 20 on said body maintain it relatively cool. The combustible mixture is formed in and by a Venturi mixing tube 22 which is screwed into the outer end 24 of a tubular extension .23 of the body I6.

The mouth of the mixing tube 22 is in open communication with an air chamber 25 to which air under appropriate pressure is delivered by a supply pipe 26 having a throttling valve 21. The air in owing through the tube 22 entrains fuel gas from-a circumferential ring of gas inlet portsv 33 in the-side, of the tube near the downstream;; side of the throat of said tube, vThe ports 3,3 are;

in opencommunication with a surrounding gas sectional area as will permit substantially all of the gas normally required to llow to said cham.l

One ofthe objects of the present invention.k

is to apply an oil conversion means :to algas burner. of` the typegabove described-so that koil .may be burned when gas is not available as .due

to gas shortage during .cold weather.

In the-present invention, the oil conversion* means comprises an oil and air conducting tube 35 of relatively small diameter and of a length to extend coaxially within the Vbore of mixing tulbe 22 from a. supporting head or fixture 36 shown as screwed into the far end wall 31 of the air chamber 25. However, as a preliminary to positioning said tube 35 in said bore, the original mixing tube 22 will be replaced by one of correspondingly larger bore so that the gas entraining capacity of the mixing tube may remain the same as before. The tube 35 is long enough to extend some distance into the passage I5 which leads to the combustion tunnel but with its discharge end far enough .back from the entrance to the tunnel to remain relatively cool.

Referring now more particularly to Fig, 3, the head 36 from which the tube 35 extends is made hollow to form an air chamber 44. The tube 35 is in open communication with said air chamy ber by way of an extension or barrel 4I screwed into the head, the tube in turn ibeing screwed into the barrel, so that the latter is in eiect an extension of said tube. The barrel terminates in relatively ,close proximity to the far end Wall of the lchamber 44 so as to be in position to receive oil spray from a metering nozzle 40 screwed into said end wall. Oil under pressure is clelivered to said nozzle by a supply pipe 42 having a shut-off valve 43. Air under relatively high pressure is delivered to the air chamber 44 by a supply pipe 45 having a shut-off valve 46.

At its discharge end the air and oil conducting tube 35 has a, restricted outlet 41 shown as formed in a, plug 48 which closes the outer end of said tube. The said outlet is of such restricted size that the oil on passing through the outlet along with the air will become so nely atomized as to appear as a mist, it being understood the air Will issue from said outlet with suicient velocity to carry the atomized oil into the combustion tunnel Il. Although only a single outlet orifice 4'! has been shown there may be a plurality ofsut'zh orifices depending on the quantity of oil' to be atomized per unit of time. The

relative proportions of air and oil discharged.. from the tube 35 will ordinarily be such that the air constitutes about ten per cent of 'What-is re.-

quired for `complete combustion. The balance of .r

the air (secondary air) for combustion'l is delivered under relatively low'pressure to the air chamber 25 by the pipe 26 for ow through the tube 22 to the combustion tunnel Il as Willznowlf responding to the lhead 36 in Fig. 1) is secured to the body 16- in any preferred Way as by means of asupportingbracket secured to said body.

AFrom the foregoing description it will now be readilyiappreciated that the present invention offers a frelatively simple and practical Way of converting-a gas burner to an oil burner Without interfering With the normal mode of operation of the gas burner when gas is available for burning.y J

What I -claimy as new is:

In a burner, the `combination of a combustion tunnelystructure. dening an air passage whose discharge end-is Ycoincident with the entrance tok saidftunnel, Wallrneans dening an air chamber having an air outlet coincident with the air inlet end of said passage so that air under pressure in said chamber may flow directly into said I passage for flow therethrough, a relatively slen- 'der tube extending into said passage from the air inlet end of the latter to a point short of the air outlet end of said passage for conducting air and` fuel. oil. to a pointadjacent `the entrance to said combustion.. tunnel', .avhollowsheadf at the inlet end of said tube and from which said tube extends, said head having an inlet for air -under pressure and having a, separate inlet for fuel oil under pressure';-said fuel oil inletcoinprising a spray nozzlefset v.tofdischarge into the inlet end of saidtube,fand:said air passage having a relativelyl restrictedwportion intermediate its ends and having at said .portion an inlet for fuel gas.

PHILIP L. KNIGHT.

REFERENCES CITED The. .following references are of :record in the le :of this: patenti; .1

UNITED STATES PATENTS Number Name.. Date 370,251-.. Field Sept. 20, 1887 982,244 Case.. Jan. 24, 1911 1,304,402.. Spire .May- 20, 1919 .Y 1,391,271.' Rushton Sept. '20, 1921 1,659,5731" Lalor .Feb. 2l, 1928 1,826,776 T Gunther? Oct. 13, 1931 1,841,698 Bar-.ber Jan. 19, 1932 1,869,252 Haden. -.July .26, 1932 2,216,508 Zinkl.'. .n Oct. 1, `119410 2,247,548.' Forster July 1, 1941 2,333,531- rFerguson.. 1| Nov. 2,1943 2,385,153 Morton Sept. 18, 1945 v FOREIGNTPATENTSF Number Country Date Great-Britain Sept. 18, 1924 

